AJAX-XMLHttpRequest im Objekt problem

[Günni]

Mein Ajax Request:

  
function updateNews(section,seite,count) {  
	  
	if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari  
		xmlhttp=new XMLHttpRequest();  
	} else {// code for IE6, IE5  
	  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");  
	}  
	  
	xmlhttp.onreadystatechange=function() {  
		if (xmlhttp.readyState==4 && xmlhttp.status==200) {  
	    	var request = xmlhttp.responseText;  
	    	document.getElementById('news_content').innerHTML = request;  
	    }  
	}  
	xmlhttp.open("GET","ajax/get_news.php?section="+section+"&seite="+seite+"&pageLimit="+count,true);  
	xmlhttp.send();  
  
}